An abrasive member providing a working surface characterized by having a multiplicity of upstanding angularly extending ridges. Particles of an abrasive material, such as diamond, are affixed to the ridges in a manner so that as the tops of the ridges wear down, fresh particles of the abrasive material...http://www.google.se/patents/US4114322?utm_source=gb-gplus-sharePatent US4114322 - Abrasive member
